Josh Barnett - became the youngest UFC Heavyweight Champion ever at 24 years old, was stripped of the title for illegal PED use, and now 15 years later he has still never reclaimed The UFC Heavyweight Title

Mark Hunt - was supposed to have the hardest punch in all of MMA and was the king of the "walkaway knockout." He was initially a kick boxer and when he transferred over to MMA he showed an absolutely remarkable aptitude for the sport. In only his 3rd pro MMA fight he defeated Vanderlei Silva and then in his 4th pro MMA fight he defeated Mirko Cro-Cop! That was back in 2005. Now all this time later in 2017 he has still failed to ever have won the UFC Heavyweight Championship or the PRIDE Heavyweight Championship while he was working of that promotion.

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Agreed on Hunt, I will argue till my dying day that he is the most overrated fighter in MMA